hargreaves



Pateniaefl Nov. 16, 1923. 3 ShEETS-S /VVENT W. HARGREAVES.

SAFETY VALVE.

APPLICATION FILED OCT. 30, 1919.

Patented Nov. 16, 1920.

3 SHEETS-SHEET 2.

w. HARGREAVES.

SAFETY VALVE.

APPLICATION FILED OCT. 30, 1919.

3 SHEETS-SHEET 3- smw E 21:3

Patented Nov. 16, 1920.

UNITED STATES PATENT OFFICE.

WILLIAM HARGREAVES, or luancrmsrna, ENGLAND, AS-SIGN'OR or ONE-HALF TO B. L. RQSS AND coivirnnr LIMITED, or srocxroar, ENGLAND.

' SAFETY-VALVE.

Specification of Letters Patent.

Patented Nov. 16, 1920.

Application filed October 30, 1919. Serial No. 334,618.

To aZZ 107mm it may concern:

Be it known that I, IVILLIAM I'IARGREAVES, a subject of the King ofGreatBritain and Ireland, residing at Ghorlton-Lcum-Hardy, Manchester, in the county of Lancaster, England, have invented new anduseful Improvements in or Connected with Safety- Valves, of which the following is a specification.

This invention relates to safety valves and in particular to mufl'led pop safety valves of the :lloss" type.

In such valves a liftable secondary area or its equivalent is used, in which holes are drilled, and, over such, a rotatable plate with corresponding holes drilled therein is fitted, adjustment of such-rotatable plate opening or diminishing steam passage way through said holes.

T he primary object of the invention is to produce more compact valves which shall not stand so high and whereby valves of the Ross type, 'and-possessing -all the advantages inherent to such valves, can be used on modern locomotives havlng high fire boxcs or 011 other boilers and the like where head room is restrlcted.

Under this invention I can considerably reduce the over-all height of such valvesso that when applied to a locomotive the valve shall. be below or clear of the loading gage.

Further objects of my invention aim at producing a cheaper construction and also a safety valve in which the assembly can be made and the safety valve tested .with the valve seat in position, and the safety valve thereafter removed and applied without in any way disturbing any of the elements. Thus, the setting obtained at the test or trial, is assured and the complete valve can be delivered in perfect order and no skill in fitting or applying is called for.

A further feature of importance is, that I can locate the valve seat low down or almost level with the boiler plates thus insuring a compact arrangement and permit.

ting a reduction in over-all height.

The attached drawingsillustrate my im-' provements applied to Inuflied. pop safety.-

valves ofthe kind indicated.

. safety valve.

Fig. 2 illustrates a modification of the construction shown in Fig. 1.

Fig. 3 is an elevation partly in section and shows a modification. 7

Fig. 4; shows an elevation, partly in section, of another construction embodying my features of novelty.

Fig. 5 is an elevation, partly in section, showing a further modification.

leferring in the first place to. Figs. 1 to 33. In the examples, Figs. 1 and 2, I-use a base ringa ofgun metal or such like to support the valvebody or casing and this base ring a is formed with two flanges a a for ready attachment of the valve body or casing thereto." This flanged base ring a is bored to two diameters of, a, and a seating a is cut or fashioned, which, by way of example stands below the level of the top of the flange a thus bringing such seating aslow as possible with relation to the flanged base ring a and consequently effecting a considerable reduction in the required over-all height of the valve.

I may makethe-valve seat 6 separate, and such valve seat is shaped tothe required form in accordance with valve-seats of the Ross type, and the same has,-or may have, a downwardly projecting extension which with the object of effecting a saving in height projects down toward the bottom face of the basering. A ring-or ferrule a applied to the bottom of the base ring, or fashioned therewith as shown, affords protection to the valve seat'duringtransit and fits the aperture ,or opening in the boiler plates or on theusual safety valve seating of whatever form to which the safety valve is applied. The form of the valve seating and its exact location near the bottom of the flanged base ring a can be varied.-

so that when the flange c of said main body or casing o rests on the upper flange a of the base ring, and the said flanges a 0 are bolted together, as shown, the valve seat?) is immovably held. Instead of the cylindrical extension 0, a separate sleeve 7 -may be used or projecting distance pieces I igiure 1 shows an elevation, partly 1nor other means by which the valve seat 6 can be held down. In the modification 1F ig. 2 the construction isfvery similar to what --su'eh-1ike,-theibore of'which is ofdifierent drical downward extension a "lengthand 1s bored to. two diameters a a so that an "internal fiange or-tshoulder a -drical extension.

insure a joint as is obvious.

hold said valve seat without the taking up of any space in the main valve body or casing.

-In themodification illustrated in Fig. 3, I dispense with the base ring: a formed with two flanges and use in lieu thereof a gun metal or other base ring or casting a which has afiange a which provides for bedding direct onto the boiler plates,seating,or the like. This casting is formed with a cylinof some is produced toward thebottom of the cylin- On this lower internal flange Idispose the valve seat'b. This is shown asmade separate and is turned with a flange approximately mid-way in its length such flange being seated on the lower internal flange aP'which is part of the cast ing a.

The valve seat is of the Ross or approved type. Such valve seat is held in place by-a downwardly projecting extension or sle'eve oordistance pieces or the like from the 'main-bodyor casting a of the valve. The main-body casting 0. of the safety valve has a flange 0 which rests on the flange a of the lower casting a and is bolted or otherwise secured thereto to compl'ete the connection of the two elements, the 'pressure exerted by the studs, bolts or the like fastening meansalsopressing the valve-seat b on to the lower flange a so as to g The studs, bolts, or the like, also serve to bolt the complete safety valve'device to the boiler plates 'ori the seating as is indicated. 'The valve seat maybe formed integral with the lower casting or be applied thereto in a different fashion from that indicated.

The boltsand studsmarked d, Figs. 1, 2

and 3, are used toholdthe valve casing to the-base ring a and to secure complete assembly ready for fixing the complete valve as is hereafter more fully explained.

Referring tothe example Fig. 4, I make use of a stout base ring of gun metal or diameters at different parts thereof, as shown at a a for application of the valve seat. The'valve seat consists of a turned sleeve 6 with an approximately central outer flange. The stout base ring a is or may be slightly reduced to provide a proper seating for the lower face ofthe outer'central flange of the valve seat b and the lower spigot of said valve seat device fits the bore a of'the stout base ring a. The main safety valve body a has a strong base flange c and is bored as to its lower extremity c for the upper spigotof the valve seat to fit same, the annular central outer flange of the valve seat I) being clamped :betweenthestout base ring'aand. thelower flange or extension 0 on the'safety valve body. The other 'elements --of-the safety valve including the actual valve are disposed in the main body 0: as will be understood.

In assembling, the valve seat b is placed in position and the main body :is held down on the stout base ring by the application-of studs cl, bolts, or screws, or such'like,'which insures thevassembly and permits the valve to leave the workmanshands fully asseur bled.

The valve can then be tested in the shop,

other holes being bored through the flange c and stout base ring a for the fixing of the complete valve'on the testing'plate', and for fixing thetested valve to the boiler,.as by the application of studs, boltsor the like as shown.

Reii'er-ring now to' Fig. 5, instead of making the va'lveseat separate, the valve-seat may *be fashioned integral with the stout base ring-ayes is illustratedin' said Fig. 5, where the valve seat is marked a or the valve seat might even bezfashioned along with the main safety valve body; or separately fixed toeither element. In such case, provision is made for insuring a: goodjjoint between the: stoutbasering a and the face or bottom of the'safety valve body 0. The elements 0 and a are in such cases heldtoget-heronz-assei'nbly by studs or the like d, and, the completesafety valve is secured by studs,'bolts or the like as indicatedto the boiler plates or mountingas is obvious. The valve casingc, Fig. 5, is shown with ashort cylindrical extension orannular lower lip ordedge c \Vith my constmictions, theholding down stlUlS oi'-l')olts,or the likepa're noturequisite tor insuring the proper disposition ofthe assembly, the complete safety valve being sent out in exact'condition as tested and approved, and the holding down studsor bolts afterward applied serveno'other function than that of securing the completely assembled valve:in place when fixed to the boiler or mounting.

. The arrangement not only insures a reduc-.

tion in over-all height; but simplifies'the con- 1 struction .and facilitates testing and offers conveniences in transit and fixing.

Under the above described constructions the valve seating is located and held in the base ring or casting and so almost at the very bottom of the complete safety valve and roper provislon is made for reaching down to and holding the valve seat without taking up any space in themain valve body or casing. lh valve retaining springs are thus kept above and out of the steam space.

The manner of locating and holding the valve seat enables the height of the indicated type of safety valves to be reduced by some inches without having to dispose any movable parts below the base line of the valve.

The valve, valve spindle, spring, ball and socket joints and secondary area, and other features found in the Ross type of safety valve, can all be accommodated in a safety valve of diminished height following the present invention.

I declare that What I claim is.

1. A safety valve, comprisin a flanged base ring having a .bore of different diamcters at difl'erent parts thereof thereby to form a shoulder; a valve seat having a flange 1e;- engagement with said shoulder, and a valve casing having a flange adapted to rest on the flange of the base ring and a cylin- (lrical extension fitting within the bore of said ring and resting 011 the flange of said valve seat.

2. A safety valve having a flanged base ring, downwardly projecting extension from such ring, said base ring having a vertically disposed bore, a valve seat, a valve fitting same, a valve casing provided with a flange adjacent to the base of said casing, a cylindrical extension from the base of said casing fitting the bore in said base ring,

means for fixing the casing flange to the base ring, and means for fixing the complete valve to the boiler seating all for the purposgs herein set forth.

3. A safety valve comprising a flanged base ring, n extension therefrom, a flange pendent flanged base ring, a tubular exten- I sion therefrom below its lowermost flange, a seating flange within said base ring, a valve casing having an exterior flange and an inner cylindrical extension below said flange, a valve seat resting on said seating flange and adapted to be clamped between the flange and the inner cylindrical extension, and means for securing the flanges of the casing and ring together thereby to hold the valve seat on said seating flange.

5. A safety valve having a base ring, a flange thereon, a downwardly projecting tubular extension therefrom, a valve seating on said base ring, a bored cavity in said ring, a valve easing, a flange on said casing,

' a cylindrical extension at the base of the casing, means for connecting the base ring flange and the valve casing flange and means for fixing the completely assembled valve to its seating as set forth.

In testimony whereof I have signed my name to this s ecification.

W LIAM HARGREAVES. 

